对称加密之AES及压缩加密解密解压综合实战

对称加密：就是采用这种加密方法的双方使用方式用同样的密钥进行加密和解密。密钥是控制加密及解密过程的指令。算法是一组规则，规定如何进行加密和解密。

因此加密的安全性不仅取决于加密算法本身，密钥管理的安全性更是重要。因为加密和解密都使用同一个密钥，如何把密钥安全地传递到解密者手上就成了必须要解决的问题。

由此可见密钥传递也是比较重要的一环，一般都是通过对密钥二次加密的方式，进行密钥的传输

加密实现代码：

1. publicstaticbyte[]encryptStringToBytes_AES(byte[]fileContentBytes,byte[]Key,byte[]IV)
2. {
3. //Checkarguments.
4. if(fileContentBytes==null||fileContentBytes.Length<=0)
5. thrownewArgumentNullException("plainText");
6. if(Key==null||Key.Length<=0)
7. thrownewArgumentNullException("Key");
8. if(IV==null||IV.Length<=0)
9. thrownewArgumentNullException("IV");
10. MemoryStreammsEncrypt=null;
11. AesCryptoServiceProvideraesAlg=null;
12. try
13. {
14. aesAlg=newAesCryptoServiceProvider();
16. aesAlg.Padding=PaddingMode.PKCS7;
17. aesAlg.Key=Key;
18. aesAlg.IV=IV;
20. ICryptoTransformencryptor=aesAlg.CreateEncryptor(aesAlg.Key,aesAlg.IV);
22. msEncrypt=newMemoryStream();
23. using(CryptoStreamcsEncrypt=newCryptoStream(msEncrypt,encryptor,CryptoStreamMode.Write))
24. {
25. csEncrypt.Write(fileContentBytes,0,fileContentBytes.Length);
26. csEncrypt.FlushFinalBlock();
27. }
28. }
29. catch(Exceptionex)
30. {
32. }
33. finally
34. {
35. if(aesAlg!=null)
36. aesAlg.Clear();
37. }
38. returnmsEncrypt.ToArray();
39. }

解密代码实现：

1. publicstaticbyte[]decryptBytes(byte[]cipherText,byte[]Key,byte[]IV)
2. {
3. if(cipherText==null||cipherText.Length<=0)
4. thrownewArgumentNullException("cipherText");
5. if(Key==null||Key.Length<=0)
6. thrownewArgumentNullException("Key");
7. if(IV==null||IV.Length<=0)
8. thrownewArgumentNullException("IV");
9. AesCryptoServiceProvideraesAlg=null;
10. byte[]buffer=null;
11. try
12. {
13. using(aesAlg=newAesCryptoServiceProvider())
14. {
15. aesAlg.Padding=PaddingMode.PKCS7;
16. aesAlg.Key=Key;
17. aesAlg.IV=IV;
18. ICryptoTransformdecryptor=aesAlg.CreateDecryptor(aesAlg.Key,aesAlg.IV);
20. using(MemoryStreammsDecrypt=newMemoryStream(cipherText))
21. {
22. CryptoStreamcsDecrypt=newCryptoStream(msDecrypt,decryptor,CryptoStreamMode.Read);
23. byte[]tempbuffer=newbyte[cipherText.Length];
24. inttotalBytesRead=csDecrypt.Read(tempbuffer,0,tempbuffer.Length);
25. buffer=tempbuffer.Take(totalBytesRead).ToArray();
26. }
27. }
28. }
29. catch(Exceptionex)
30. {
32. }
33. finally
34. {
35. if(aesAlg!=null)
36. aesAlg.Clear();
37. }
38. returnbuffer;
39. }

客户端加密解密文本文件实战：

1. ///<summary>
2. ///加密解密
3. ///</summary>
4. privatestaticvoid_EncryptAndDecrypt()
5. {
6. ASCIIEncodingasciiEnc=newASCIIEncoding();
7. byte[]initVectorBytes=asciiEnc.GetBytes("@1B2c3D4e5F6g7H8");
9. //RandomlygenerateorBookkey-keyK2-Keytoencryptxmlcontent
10. stringkeyK2=Generator.RandomString(10);
11. //Generatethe128bitstringusingMD5forkeyK2
12. MD5hashProvider=MD5.Create();
13. byte[]md5EncryptedKeyK2=hashProvider.ComputeHash(asciiEnc.GetBytes(keyK2));
15. stringfilename="NewTextDocument.txt";
16. stringfilepath=Environment.CurrentDirectory+""+filename;
18. byte[]Content=Encryption.encryptStringToBytes_AES(File.ReadAllBytes(filepath),md5EncryptedKeyK2,initVectorBytes);
19. stringencryptfilepath=Environment.CurrentDirectory+"encrypt"+filename;
20. File.WriteAllBytes(encryptfilepath,Content);
22. byte[]decryptContent=Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),md5EncryptedKeyK2,initVectorBytes);
23. stringdecryptfilepath=Environment.CurrentDirectory+"decrypt"+filename;
24. File.WriteAllBytes(decryptfilepath,decryptContent);
26. }

压缩解压：

1. stringfilename="NewTextDocument.txt";
2. stringfilepath=Environment.CurrentDirectory+""+filename;
3. stringzipfilepath=Environment.CurrentDirectory+"NewTextDocument.zip";
4. using(ZipFilecontentZip=newZipFile())
5. {
6. //压缩
7. contentZip.AlternateEncoding=Encoding.GetEncoding("iso-8859-1");
8. contentZip.AlternateEncodingUsage=ZipOption.Always;
9. ZipEntrycontentFile=contentZip.AddEntry(filename,File.ReadAllBytes(filepath));
10. contentZip.Save(zipfilepath);
13. //解压
14. contentZip.ExtractAll(Environment.CurrentDirectory);
15. }

压缩加密解密解压：

1. stringfilename="NewTextDocument.zip";
3. stringfilepath=Environment.CurrentDirectory+""+filename;
4. stringzipfilepath=Environment.CurrentDirectory+""+filename;
6. ZipFilecontentZip=newZipFile();
8. contentZip.AlternateEncoding=Encoding.GetEncoding("iso-8859-1");
9. contentZip.AlternateEncodingUsage=ZipOption.Always;
10. varbytecontent=File.ReadAllBytes(Environment.CurrentDirectory+"NewTextDocument.txt");
11. ZipEntrycontentFile=contentZip.AddEntry("NewTextDocument.txt",bytecontent);
12. contentZip.Save(zipfilepath);
14. ASCIIEncodingasciiEnc=newASCIIEncoding();
15. byte[]initVectorBytes=asciiEnc.GetBytes("@1B2c3D4e5F6g7H8");
17. //RandomlygenerateorBookkey-keyK2-Keytoencryptxmlcontent
18. stringkeyK2=Generator.RandomString(10);
19. //Generatethe128bitstringusingMD5forkeyK2
20. MD5hashProvider=MD5.Create();
21. byte[]md5EncryptedKeyK2=hashProvider.ComputeHash(asciiEnc.GetBytes(keyK2));
23. byte[]Content=Encryption.encryptStringToBytes_AES(File.ReadAllBytes(filepath),md5EncryptedKeyK2,initVectorBytes);
24. stringencryptfilepath=Environment.CurrentDirectory+"encrypt"+filename;
25. File.WriteAllBytes(encryptfilepath,Content);
27. byte[]decryptContent=Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),md5EncryptedKeyK2,initVectorBytes);
28. stringdecryptfilepath=Environment.CurrentDirectory+"decrypt"+filename;
29. File.WriteAllBytes(decryptfilepath,decryptContent);
31. contentZip.ExtractAll(Environment.CurrentDirectory+"unzipdecrypt");
32. stringkey=Convert.ToBase64String(md5EncryptedKeyK2);
33. stringiv=Convert.ToBase64String(initVectorBytes);
34. Console.WriteLine(key);
35. Console.WriteLine(iv);
37. byte[]decryptContent1=Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),Convert.FromBase64String(key),Convert.FromBase64String(iv));
38. stringdecryptfilepath1=Environment.CurrentDirectory+"decrypt1"+filename;
40. contentZip.ExtractAll(Environment.CurrentDirectory+"unzipdecrypt1");
42. File.WriteAllBytes(decryptfilepath1,decryptContent1);

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